DE3011693A1 - CAMERA WITH ELECTROMAGNETIC DRIVE SOURCE - Google Patents

Description

TlEDTKE - BüHLING "KlNNE ^ - "'I

GROUP - Pellmann "'" "Drpi.-rng / KTiedtke

HUPE Γ tLLMANN Dipl.-Chem. G. Buehling

- 4 - Dipl.-Ing. R. Kinne

Dipl.-Ing. R Group Dipl.-Ing. B. Pellmann

Bavariaring 4, Postfach 20 8000 Munich 2

Tel .: 089-539653 Telex: 5-24845 tipat cable: Germaniapatent Mund

March 25, 1980 DE 0300

CANON KABUSHIKI KAISHA

Tokyo / Japan

Electromagnetic drive camera

source

The invention relates to cameras and more particularly relates to an electromagnetically driven one Focal plane shutter equipped cameras.

So far, the drive source to achieve the The shutter curtains of a camera shutter run off generally a feather use. On the other hand, there is recent with the advancing electronic Equipment of cameras predominantly the tendency, the exposure setting, the photographic control sequence and the like. To be controlled electrically. There is also the shutter drive system in cameras equipped with a lot of electronics is still mechanically constructed, appears from the point of view! of "electronization" the whole construction of such a camera as complicated as before. To simplify this complicated structure it has recently been proposed to drive the shutter electromagnetically.

X / rs

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D «ut * ehe bank iMun>; (»> n) loo. 51-610 / 0 Dresdner B »nk (Munich) loo. 3939 844 Postal check (Miinchanl account Θ70-43-804

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When using an electromagnetic drive source in a camera, via which the shutter is driven or actuated by electromagnetic forces, Of course, there is no need for moving mechanical parts of the most varied of types, as in the case of conventional ones To have to use cameras, whereby the camera structure can be considerably simplified.

Difficult to mount an electrical power source inside the camera body However, the limited space available means using a battery to a large extent required large capacity and thus large dimensions. For this reason, the shutter curtains and their drive and actuation devices are designed to be as light as possible, with their moving parts Have to work with the lowest possible friction, so that an electromagnetic drive source with low Dimensions, which has a lower electrical power consumption, can be considered. at However, if these requirements are taken into account or if they are met, the camera will be extremely sensitive to shock. because when a shock occurs, the shutter curtains are in the ready-to-run starting position for an exposure these are inadvertently set in motion and thus cause unintentional exposure of the film or a control switch for power supply of the electromagnetic drive source is erroneously operated is, with the result that the shutter curtain or curtains expire.

It is also known that the shutter curtain upon completion of its drainage movement and impact on a mechanical stop or catching part tends to move from

bounce back that part, creating part of the opening area of the image window is blocked or the image window is reopened and thus an incorrect exposure of the film is obtained. With the usual slot

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Shutter is such an impact of the shutter curtain through the use of a friction brake or a locking pawl avoided to prevent recoil. One such common crash prevention device however, not only requires fine adjustments in assembly, but also requires a control device to release the locking pawl. This in turn complicates the structure and has proven to be unsuitable for use in conjunction with a Electromagnetic, powered or actuated lock proved.

The invention is therefore based on the object of a an electromagnetically operated focal plane shutter having a single-lens reflex camera with a Equip locking device that in the starting position of the shutter curtains before their expiry j accidental actuation of the shutter curtains due to incorrect actuation of a power supply; Control switch, by a shock or the like. Is prevented.

In addition, the camera should be designed in such a way that the shutter curtains impact using the electromagnetic drive source.

This object is achieved with the means specified in claim 1, according to which in particular the The locking device is designed in such a way that the lock is released as a function of the upward pivoting movement of the oscillating mirror {rapid mirror) of the single-lens reflex camera takes place, so that also in the event of an incorrect operation of the

^JJ control switch taking place the application of electric power to the electromagnetic drive source

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Shutter release and thus unintentional exposure is prevented.

An electromagnetic device is used here, which controls the operation of the locking device controls to lock and release or trigger the shutter curtains.

Developments of the invention are identified in the sub-claims.

The invention is described in more detail below on the basis of exemplary embodiments with reference to the drawing.
15th

Show it:

Fig. 1 is an exploded perspective view

Representation of a first embodiment of an inventively designed

designed camera shutter,

FIG. 2 is a perspective view showing the details of the camera shutter according to FIG Fig. 1 and an electromagnetic

Drive source illustrates

3 shows an electrical circuit diagram partially in the form of a block diagram a control circuit for controlling

of the camera shutter according to Fig. 1,

Fig. 4 is an exploded perspective view of a second embodiment,

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FIG. 5 shows a control circuit for the exemplary embodiment according to FIG. 4,

6 is an exploded perspective view Representation of a third embodiment

for example,

7 shows a third embodiment of the control circuit,
10

8 shows a fourth embodiment of the control circuit,

9 shows a control signal diagram of the circuit arrangement according to Fig. 8,

Fig. 10 is an exploded perspective view of a fifth embodiment,
20th

FIG. 11 is a circuit diagram of a control circuit for the exemplary embodiment according to FIG. 10, and

12 shows a control signal diagram of the circuit arrangement according to FIG. 11.

In Fig. 1, the reference number 1 denotes a winding axis, which together with a (not shown) The camera's transport lever rotates and has a cam plate 2 attached to its lower end. The reference number denotes a lever pivotable about an axis 3b, which is provided with a pin 3a and one with the Cam plate 2 engaged fixedly attached

Cam follower 4 carries. Numeral 5 denotes one

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for tensioning a diaphragm and mirror drive mechanism serving connecting lever which is about an axis 5c is pivotable and cooperates with the pin 3a via an intermediate member (not shown). One at the end of the lever 5 firmly attached pin 5b is with an arm of a clamping lever described in more detail below 60 engaged. The reference numeral 10 denotes a release device of the camera which is an electromagnet 8 having a permanent magnet 9. With a carried by a support lever 7 anchor is designated 8a, the is attracted by the electromagnet 8. The reference numeral 6 denotes a release signal lever, which is attached to a common axis 7b of the support lever 7 is attached so that the two levers can rotate together. With 7a denotes a spring which acts on the armature 8a in order to achieve a direction away from the electromagnet 8 Movement acts. With a pin 6b is designated, which is fixedly attached to the trigger signal lever 6 and with a leaf spring 5a fixedly attached to the connecting lever 5 is engaged. There is also 6 on the lever a pin 6a fixedly attached to an arm 11b of a trip lever 11 in engagement.

The release lever 11 is pivotable or rotatable about an axis 11d, with its opposite end part 11c Is fork-shaped and is in engagement with a rear end piece of a locking lever 12 rotatable about an axis 12a. With the reference number 13 is

denotes a drive lever which pivot about an axis 13e

° is bar or rotatable and, when rotated in the counterclockwise direction, tensions a diaphragm drive spring 13a. The drive lever 13 has an end part 13c that engages with a hook-shaped end part of the lock lever 12

can be brought and thereby locked in the clamping state. 35

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Numeral 15 denotes a shutter drive lever, which is pivotable or rotatable about the axis 13e, wherein an angled portion 15b of its one arm engaged with a pin (not shown) for automatic aperture control of a lens stands. In the middle of an arm of the drive lever 13, a pin 14c is fixedly attached, through which an intermediate or Link lever 14 is rotatably supported by a spring 14a for clockwise rotation is biased to engage the opposite end 15a of the shutter drive lever 15. With 15c denotes a spring that controls the shutter drive lever 15 forces in a direction in which it comes into engagement with the intermediate lever 14. The tension lever 60 is rotatable or pivotable about an axis 60d, one arm 60c of which engages with a pin 5b of the connecting lever 5 stands, while the free end 60b of a pin 60a fixedly attached in the middle of this arm with one arm 13b of the drive lever 13 is engaged, whereby a clockwise rotational movement of the connecting lever takes place 5 can be transferred to the drive lever 13 for tensioning the spring 13a. The release lever 11 is from a weaker spring 11a in relation to the spring 7a in FIG Biased counterclockwise, with an arm 11b constantly connected to the pin 6a of the trigger signal lever 6 in Engagement is.

The reference numeral 17 denotes an automatic diaphragm opening signal lever which rotates about an axis 17a. or is pivotable and engages with a pin 14b located on the intermediate lever 14 Arm 17c and one with the lower end of a mirror return signal lever 30 has engaged further arm 17b. The reference number 16 denotes an

impact, which limits the range of motion of the drive jack 13 limited.

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Reference numeral 18 denotes a mirror drive lever which is rotatable about a stationary axis 18d and is engaged at its lower end part with an arm 13d of the drive lever 13, with its upper end part has a bent portion with which a mirror drive spring 18a is connected. An axle 18c is fixedly attached to the lower arm of the mirror drive lever 18, on which a locking lever 23 is pivotably mounted. The locking lever 23 is by a spring 23a for biased a clockwise movement and has at its free end a hook 23a, which with a The latch portion 22b of a mirror folding lever 22 rotatable about the axis 18d can be brought into engagement.

The reference number 24 denotes an intermediate lever rotatable about an axis 24c, the one with a pin 25a a mirror support plate 25 engaging Endab section 24b and one on its opposite arm has fixedly attached pin 24a and is in engagement with an arm 22c of the mirror flip-up lever 22. Reference number 26 denotes an axis of rotation, while reference number 27 denotes an oscillating mirror or rapid mirror designated.

An arm of the mirror drive lever 18 is connected to a Projection 18b provided with a lower free end portion of a switch operating lever 51 in engagement can be brought. The switch operating lever 51 is rotatable or pivotable about an axis 51c and is operated by a spring

51a biased to move counterclockwise with its opposite arm 51b so arranged is that when one of the contact elements comes into contact with a monitor that monitors the end of the mirror flip-up movement Make contact signal switch 29 this switch

.

closes. In addition, the arm 51b on its lower side with the upper end of one below can be even closer described shutter curtain locking plate 34 come into engagement.

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In addition, a signal lever 52 provided for the rear shutter curtain can be pivoted on the axis 51c stored, the one with a drive arm described in more detail below for the rear shutter curtain engaging arm 5 2a and an opposite arm 52b having one end 30a of the mirror return signal lever 30 is engaged. The mirror return signal lever 30 is on one axis 3Of pivotally mounted, a pin 30b fixedly attached to one arm of the lever with the opposite one Arm 23b of the lock lever 23 is engaged. The reference numeral 41 denotes a shutter base plate, which is provided with a picture window 41a, while the reference numeral 42 is a front shutter curtain and the Reference numeral 43 denotes a rear curtain.

As shown in detail in FIG. 2, the front shutter curtain 42 consists of three opaque ones thin slats 42-1, 42-2 and 42-3, which are articulated to two drive arms 36 and 36 'via pins 42a to 42f and are arranged to move along the shutter base 41, thereby opening the picture window 41a is opened and closed. The arm 36 'is located on one of the closure base plate 41 Axis 36 ″ pivotally mounted, while the arm 36 on a drive shaft 35 of an electromagnetic drive source 67 for the front shutter curtain is fixedly attached and carried by the shutter base plate 41 so that it is rotatable together with the drive shaft 35.

The rear shutter curtain 43 consists of three similar thin slats 43-1, 43r2 and 43-3, which extend over Pins 43a to 43f are articulated to drive arms 38 and 38 'and are arranged in such a way that they open the picture window open and close in a similar manner to the front shutter curtain.

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The arm 38 'is on one of the lock base plate 41 located axis 38a pivotably mounted, while the arm 38 on a drive shaft 37 of a (not shown) electromagnetic drive source for the rear shutter curtain is fixedly attached and through the common Rotational movement with the drive shaft 37 is pivotable.

The electromagnetic drive source 67 comprises a frame 65, a permanent magnet 62 fixed with a portion fixed to the frame 65 and a coil 66 rotatable about the permanent magnet 62, the drive shaft 35 fixed to the coil 66 in fitting holes 65a and 65b provided in the frame 65 is held rotatably. The reference numeral 6f denotes a yoke arranged around the coil 66 and fixedly attached to the frame 65. While only the electromagnetic driving source is shown in Figure 2 for the front curtain, however, the electromagnetic Antriebsquel * -. ¹ Ie for the rear curtain or a similar same structure. If the coil of the respective electromagnetic drive source is supplied with current, the associated drive shaft 35 or 37 rotates in a predetermined range lying within 180 °, whereby the arms 36 and 38 are driven or adjusted and the front and rear shutter curtains are in move their expiry positions.

As can be seen again in FIG. 1, the drive shaft 35 for the front shutter curtain is at the free end an arm 35a, which is used to reset the shutter, is fixedly attached, which is connected to an arm 22a of the mirror flip-up lever 22 can engage.

Reference numeral 34 denotes a shutter lock plate, which is slidably attached to the shutter base plate 41 and by a spring 34a for an upward movement (according to FIG. 1) is biased. With 34b a projection is designated, which with a Kl-

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kenabschnitt 36a of the drive arm 36 for the front shutter curtain engages, while with 34c a projection is designated, which is provided with a pawl member 38a the rear curtain drive arm 38 engages. When the closure of FIG the starting position is reset and ready for the sequence movement, the front shutter curtain closes the image window 41a while the rear shutter curtain is moved out of the image window. Here the rear shutter curtain is subjected to a further upward movement by a stop member (not shown) prevented, while the front shutter curtain with its uppermost lamella 42-3 via a (not shown) Stool pushes against the slat 43-1 of the rear shutter curtain and another upward movement is prevented. Incidentally, the shutter curtains 42 and 43 are opened by engagement of the lock plate prevented with the drive arms from a downward movement from the positions shown in FIG. Through this Locking is thus guaranteed that even by a shock or accidental application of the Coil with current no faulty tripping can occur.

in Fig. 3 an electrical circuit diagram is shown, this is an embodiment of a control circuit for controlling the operation of the shutter mechanism 1 and 2 shows. In Fig. 70, reference numeral 70 denotes a photo element (silicon photo cell),

^ while the reference number 71 denotes an operational amplifier which represents a preamplifier for the photo element 70 connected between its two inputs, a diode 72 serving for logarithmic signal compression being connected in a feedback branch of the operational amplifier 71. The reference number 73 denotes

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net a computing circuit of known type. The reference numeral 7 4 denotes a variable resistor for setting a predetermined Blenöen latching number value ( Δ, Av), while the reference numeral 75 denotes a variable resistor for setting an ASA film sensitivity value (Sv) of the film used in each case. The arithmetic circuit 73 emits an output signal which represents the shutter time value (Tv) to be controlled. The reference numeral 76 denotes a capacitor for storing the shutter speed value Tv, while the reference numeral 77 denotes a changeover switch which is normally connected to a contact "a" and is switched to a contact "b" in response to an upward movement of the oscillating mirror. Reference numeral 78 denotes an operational amplifier which constitutes a voltage follower circuit. Reference numeral 79 denotes a logarithmic signal expansion transistor, the collector of which is connected to a timing capacitor 80. Reference numeral 81 denotes a switching transistor for the start of counting, while reference numeral 82 denotes an operational amplifier forming a comparator circuit, the non-inverting input of which is connected to the collector of the signal expansion transistor 79, while a reference voltage Vs is supplied to the inverting input. The reference number 83 denotes a differentiating element connected to the output of the comparator circuit 82, while the reference number 84 denotes a timer circuit which is fed by the negative differentiating pulse of the differentiating element 83 for outputting a predetermined time (of e.g. 20 ms)

continuous high-level output signal is triggered. Reference numeral 85 denotes a differentiator, which is connected on the input side to the output of the timer circuit 84.

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The reference number 29 denotes a normally open contact switch, which is closed at the end of the upward movement of the oscillating mirror. Closing this Switch causes a downstream differentiating element 87 to emit a negative differentiating pulse.

Reference number 88 denotes an RS flip-flop circuit, the set input of which is connected to the output of the differentiating element 87 and the Q output of which is connected to a delay element 89. The delay element 89 in turn has an output Q ¹ which is connected to the base of the count start switching transistor 81 via a resistor.

With Tr1 a transistor is referred to, the base of which with the Q output of the flip-flop circuit 88 and the Collector connected to a constant current source 93 are, the constant current source 93 in turn ■. with one part of the drive source for the front shutter curtain forming coil 66 is connected. With Tr2 igt denotes a transistor whose base with the The output of the timer circuit 84 and its collector are connected to a constant current source 95, wherein the constant current source 95 in turn with one part of the drive source for the rear shutter curtain forming coil 66 'is connected. The reference number 99 denotes a trigger switch which is marked with a (not Shown) shutter release button interacts. Numeral 97 denotes a differentiator while reference numeral 98 denotes a timer circuit,

which on the output pulse of the differentiator 97 responds to form an output signal representing a predetermined period of time. With Tr9 is on denotes transistor connected to the output terminal of the timer circuit 98, while the reference

number 8 denotes the electromagnet of FIG.

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The mode of operation of the exemplary embodiment according to FIGS. 1, 2 and 3 will be discussed in greater detail below. It is assumed here that all mechanisms shown in the figures have a position take, in which the shutter is returned to the starting position and the drainage of its front and rear shutter curtain can be done.

In this state, when the release button (not shown) is pressed, the release switch becomes 99 according to FIG. 3 closed. As a result, the differentiator 97 triggers the timer circuit, which the formation of a high level signal for a predetermined period of time. The transistor Tr9 becomes accordingly switched through and supplies the electromagnet 8 with electrical energy. This creates the attraction of the permanent magnet 9 according to FIG. 1 canceled or compensated and the armature 8a by the spring 7a moved counterclockwise. The pin 6a of the release signal lever 6 coupled to the support lever 7 thus presses against the release lever 11, which pivots clockwise against the spring force of the spring 11a will. As the locking lever 12 is now rotated counterclockwise by the release lever 11, it releases the engagement with the end portion 13c of the drive lever 13, which is now pivoted clockwise by the spring 13a will. This movement of the drive lever 13 causes a joint rotary movement via the intermediate lever 14 the shutter drive lever 15 clockwise ,.

^ou which in turn rotates a pin (not shown) of a diaphragm drive ring in the lens mount in a clockwise direction. In this way, diaphragm blades (not shown) are closed up to the predetermined diaphragm opening value. This movement of the

The drive lever 13 also causes the mirror drive lever 18 to be counterclockwise by the spring 18a

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is rotated when the drive lever 1.3 moves with its free end from the lower end portion of the mirror drive lever 18 moved. The mirror drive lever 18 and mirror pop-up lever 22 rotate on top of the same axis in the same direction together with the flip-up locking pawl 23, while the arm 22c of the mirror lift-up lever 22 against the pin 24a of the intermediate lever 24 pushes, so that this lever is rotated counterclockwise, which in turn results has that the opposite end portion 24b of the intermediate lever 24, the mirror support plate 25 above that located on her The pin 25a rotates about the axis 26 and the mirror support plate 25 thus rotates against the spring force of the spring 28 is folded up.

This upward movement of the mirror also has the effect that the changeover switch 77 according to FIG. 1 from the contact "a" switches to the contact "b", whereby the shutter time value Tv in the capacitor 76 of the circuit arrangement according to FIG. 3 is stored. Since the circuit arrangement according to FIG. 3 is activated by closing a (not shown) The main switch or battery switch is put into operation before the release button is pressed, the operational amplifier 71 outputs an output signal in Form of a dependent on the object brightness Bv and the F number Avo of the fully opened lens Voltage from the calculation circuit 73 together with that by the number of the minimum possible aperture value the aperture value and the film speed value Sv is processed to form an output signal representing a shutter speed value Tv. These Shutter time information Tv is thus stored in the capacitor

76 entered and saved there. 35

When the mirror drive lever 18 turns the mirror 45 °

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rotates at which value the upward movement of the mirror is completed, the projection 18b of the mirror drive lever rotates 18 the operating lever 51 against the spring force of the spring 51a in a clockwise direction, wherein the free end part 51b of the operating lever 51 the locking plate 34 against the spring force of the spring 34a downwardly so that the projections 34c and 34b of the locking plate 34 disengage from the pawl parts 38a and 36a of the drive arms 38 and 36 advised for the shutter curtains. The actuation or release the shutter curtains can now be done. At this point the shutter curtains are fitted with appropriate Means such as B. by frictional action, a pawl and a spring or a spring lock of known type, held stationary, otherwise due to her own weight would malfunction. In addition, this movement of the operating lever 51 leads to close the switch 29, whereby the differentiator 87 according to FIG. 3 is activated. This sets the flip-flop circuit 88 and outputs its Output stage Q emits a high-level signal. This signal turns on the transistor Tr1, so that on current regulated by the constant current circuit 93 flows through the coil 66, with the result that in the in the magnetic field lying part of the coil winding according to FIG. 2, a force is exerted. Since this force is applied to the Drive shaft 35 exerts a moment, the drive shaft 35 is rotated in a clockwise direction, whereby the front curtain drive arm 36 is moved clockwise so that the The front shutter curtain opens the picture window and thus initiates the exposure. Setting the flip-flop circuit 88 also causes the delay element 89 to generate a high-level signal with a predetermined value

Time delay outputs, whereupon the transistor 81 blocks. This starts charging the capacitor

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80 by the collector current of transistor 79. Since the Base of transistor 7 9 is connected to the output of amplifier 7 8, this collector current corresponds to the by logarithmic expansion of the Tv information stored in the capacitor 76. The charge of the capacitor 80 is thus carried out as a function of the determined on the basis of the object brightness Shutter speed value, d. i.e., the voltage across the capacitor reaches the magnitude of the reference voltage Vs. Time interval that depends on the Tv value. Through this the output signal of the comparator circuit 82 is inverted and triggers the differentiating element 83, the again a differentiating pulse to trigger the Timer circuit 84 outputs. In a predetermined time, the timer circuit 84 generates a high level signal, by which the transistor Tr2 is turned on, so that a constant current through the coil 66 'of the electromagnetic Drive source for the rear shutter curtain flows. As a result, the drive shaft 87 rotates in the direction of the arrow, whereby the shutter curtain 43 closed and the exposure is ended. The time during which the output signal · of the timer circuit 84 remains at a high level is higher than that from start to finish to some extent the running movement of the rear shutter curtain required time, thereby ensuring becomes that the shutter closes with high reliability. When the output from the timer circuit 84 high level signal ends, d. i.e., when the output of the timer circuit 84 after closing of the shutter goes to a low level, the differentiator 85 is used to output a differentiating pulse triggered, which is fed to the flip-flop circuit 88 to reset it. The termination of the Exposure control thus leads to the blocking of the transistors Tr1 and Tr2.

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While the drive shaft 37 rotates in the direction of the arrow and run down the rear shutter curtain begins, the pawl part 38a of the arm 38 abuts against the arm 52a of the signal lever 52, whereby the arm 52a in Is rotated counterclockwise. The signal lever 52 pushes against the free end part 30a of the Signal lever 30 so that the signal lever 30 rotates clockwise. Here also the one with the rotates stepped part of the signal lever 52 in engagement Actuating lever 51 counterclockwise.

The clockwise movement of the signal lever 30 causes the pin 30b to become the locking pawl 23 rotates counterclockwise and releases it from its engagement with the mirror flip-up lever 22.

The mirror support plate 25 is then no longer held in the folded-up position and returns through the Action of the return spring 28 back in the position shown.

At this time, the intermediate lever 24 also rotates clockwise, its movement via the Pin 24a and arm 22c is transmitted and a rotation of the mirror flip-up lever 22 in a clockwise direction for Has consequence, whereby the reset lever 35a is rotated by the arm 22a in the direction of arrow. Because at this point the electrical power supply of the electromagnetic drive sources has already been interrupted, causes this Rotational movement of the reset lever 35a that the drive arm 36 rotates in the counterclockwise direction. To this

^{In this} way, the front and rear shutter curtains are returned to their original positions. At the same time, the locking plate 34 is also moved back, since it is moved upwards by the spring force of the spring 34a, so that the lock is again by means of the

Latch parts 36a, 38a is locked.

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As described above, when the signal lever 30 is rotated, the signal lever 17 rotates in FIG Counterclockwise, whereby the intermediate lever 14 is counterclockwise via the engaged pin 14b is rotated so that the downward extending portion 15a of the shutter drive lever 15 out of engagement with the intermediate lever 14 device. The shutter drive lever 15 is then counter-clockwise by the spring 15c rotated, whereby the aperture blades via a Mechanistnus known type can be fully opened. In this way is a first half cycle of the photographic Process completed.

The second half cycle of the photographic process, in which the film is produced, will now be explained in more detail is advanced by one frame. When the transport lever (not shown) is actuated, the Winding axis 1. rotated in the direction of the arrow, whereby the lever 3 rotated clockwise about the axis 3b when the cam 2 abuts against the cam follower 4. Depending on this movement, it rotates the connecting lever 5 in a clockwise direction about the axis 5c, against which it engages with the pin 5b located end portion 60c of the tensioning lever 60 presses so that the tensioning lever 60 clockwise around the axis GOb is rotated. The stepped section 60b of the pin 60a located on the tensioning lever 60 'presses against the arm 13b of the drive lever 13, whereby the drive lever 13 counterclockwise around the axis 13e is rotated and with its arm 13c in engagement with the locking lever 12 device. This rotational movement of the drive lever 13 also has the effect that the drive spring 13a is tensioned and that the free end part 14b of the intermediate lever 14 again with the bent portion

15a of the diaphragm drive lever 15 engages. aside from that presses the leaf spring 5a of the connecting lever 5 against

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the pin 6b of the signal lever 6, whereby the signal lever 6 counter to the spring force of the spring 7a in a clockwise direction is rotated and the armature 8a located on the support lever 7 comes into contact with the electromagnet 8 and is held in this position by the force of attraction exerted by the permanent magnet 9.

The above-described rotational movement of the drive lever 13 also causes the mirror drive lever 18 due to the engagement of its lower end portion with the drive lever 13 clockwise to the Axis 18d is rotated, causing the mirror drive spring 18a is stretched. The lock lever 23 moves together with the rotation of the mirror drive lever 18 and comes back into engagement with the mirror flip-up lever 22, whereby the preparation for the next image exposure is completed.

In ..the embodiment described above the shutter locking member is constructed and arranged such that it is made using the spring 3 4a is held in its active position. In a further embodiment shown in FIGS however, the shutter locking member is held by a magnet and is electromagnetically releasable or can be triggered.

In Fig. 4, the reference number 40 is an electromagnet and the reference number 48 is a permanent magnet

denotes the one on the upper end portion of the shutter lock plate 34 'is firmly attached and serves as an anchor for the electromagnet 40. Im aberrated State of the electromagnet 40, the armature 48 is held on the yoke of the electromagnet 40, whereby the

^OJ locking plate 34 'held in its active position

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will. Numeral 3 4a denotes a spring which secures the locking plate for downward movement in the position shown in FIG of the figure, while reference numeral 34d biases a link arm for one end of the Designated spring 34a. Reference numeral 30 'denotes a signal lever having a function similar to that above Mirror return signal lever 30 described, but with a permanent magnet 31 at the upper end portion of the Signal lever 30 'fixedly attached and arranged in such a way is that it is held on the yoke of an electromagnet 32 when the electromagnet 32 is not energized will. With a spring 30a is referred to, the signal lever 30 'for one of the electromagnet 32 biases away movement. At 51 'is a Designated about an axis 51c rotatable switch control lever, the lower end portion with the projection 18b of the mirror drive lever 18 and its upper end portion with a termination of the upward movement of the mirror indicating signal switch 29 can be brought into engagement. With 51a a spring is referred to, which the switch control lever 51 'for counterclockwise movement pretensioned. Reference numeral 33 denotes a lever rotatable about an axis 33c, the one with the arm 3 4d of the locking plate 34 'engaged arm 33a and one with one fixed to the upper end of the signal lever 30 '. attached pin 30d has engageable further arm 33b.

The reference numeral 39 denotes a normally open ¹ ^ "switch, which is arranged such that it is of a

curved arm can be closed 38d of a drive lever 38 'for the rear curtain. With the exception of the aforementioned parts, all parts correspond to those of the embodiment according ^OJ Fig. 1 with parts having the same functions have the same reference numerals.

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In Fig. 5, a control circuit for the embodiment of FIG. 4 is shown, in the same or Similar parts as in the circuit arrangement according to FIG. 3 are provided with the same reference numerals. In Fig. 5, reference numeral 96 denotes one to the output of the differentiator described above 87 connected timer circuit, the output of which is fed to a transistor Tr7 and this for one predetermined period of time during which the electromagnet 40 is energized. The reference number 39 denotes the aforementioned normally open contact switch, which is operated by the drive lever 38 "for the rear shutter curtain can be closed. When this switch is closed, a differentiator 97 'gives a pulse away. The reference numeral 97 denotes a timer circuit, which is determined by the differentiator 97 ' .Differentiation pulse given is triggered and then a high level output for a given Period of time outputs, while with Tr8 one of the output signal of the timer circuit 97 for energizing the above called electromagnet 32 is referred to as a switchable transistor.

The operation of this embodiment will now be described in more detail. In the example 4, the automatic shutter and mirror drive mechanism is tensioned, the shutter curtains are on the locking plate 34 with the

Pawl parts 36a, 38a of the drive levers 36 and 38 "in on

Engagement and the locking plate 34 locked the front and rear shutter curtain in their original positions under the action of the Permanent magnets 48 exerted attraction. If a release button (not shown) is in this position

is pressed, the release switch 99 becomes like the

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embodiment described above for exciting the electromagnet 8 closed, whereby the release lever 11 rotated and the locking connection with the drive lever 13 is released. By in the mainspring 13a stored energy, an automatic Biendenexnstellvorgang is carried out. In connection with this the mirror drive lever 18 is used to fold up the Oscillating mirror 27 rotated. When the upward movement of the mirror is complete, the protruding one stands Part of the mirror drive lever 18 engages the lower end of the switch control lever 51 ', whereby the Switch control lever 51 'geqen the spring force of the spring 51a is rotated clockwise about axis 51c.

The switch 29 is then closed and the differentiating element 87 emits a differentiating pulse. This pulse is fed to the timer circuit 96, which is thereby triggered and a high level Output signal generated for a predetermined period of time.

This high-level signal turns on the transistor Tr7 to excite the electromagnet 40, whereby an oppositely polarized magnetic flux to that generated by the permanent magnet 48 magnetic flux forms. The attractive force exerted by the permanent magnet is therefore temporarily canceled or compensated so that the locking plate 3 4 move downwards under the spring force of the spring 3 4a can. This releases the drive arms 36 and 36 from their locking connection. The closure

^ου curtains can thus be actuated due to the locking releases, but are held stationary in their initial positions by frictional engagement or by other means in the manner already described above until the electromagnetic drive sources are supplied with electrical energy.

030042/0725

- 27 - DE 0300

In the meantime, the one from the differentiator 87 emitted differentiating pulse has also been fed to the set input S of the flip-flop circuit 88, whereby the flip-flop circuit 88 is set and emits a high-level output signal via its output Q. This signal turns on the transistor Tr1, whereupon one regulated by the constant current circuit 93 Current flows through the coil 66 of the electromagnetic drive source for the front shutter curtain. the Operation of the front and rear shutter curtains is the same as that described above controlled first embodiment.

When the electromagnetic drive source for the rear shutter curtain is energized, the rear curtain runs Shutter curtain off. At the end of the movement of the rear Closure curtain occurs the drive arm 38 ″ over its extension 38e with the Sigrialschalter 39 for the rear Shutter curtain engages and closes the switch.

The differentiating element 97 'is thereby activated and triggers the timer circuit 97, which in turn turns on the transistor Tr8 to energize the electromagnet 3 2. This loses the attraction of the firmly attached to the upper end of the signal lever 30 ' Permanent magnets 31 temporarily have their effect and thus enables one on the spring force of the spring 30a based movement away from the electromagnet. This turns the signal lever 30 'clockwise rotated about the axis 30f. This movement of the signal lever 30 'causes the one in engagement with it Signal lever 17 is rotated counterclockwise about the axis 17a, which in turn has the consequence that the Intermediate lever 14 out of engagement with the automatic Aperture drive lever 15 releases. The aperture

030042/0725

- 28 - DE 0300

Drive lever 15 is then returned by the spring force of spring 15a to completely open the diaphragm blades. In addition, the locking lever 23 is rotated about the axis 18c by the pin 30b located on the signal lever 30 ", whereby the flip-up lever 12 is released from the locking connection. As described above, the mirror 21 is thus quickly returned by the return force of the spring 28, while the reset lever J 35a through the arm 22b of the flip-up lever 22 for the return

position of the front and rear shutter curtains is rotated counterclockwise.

At the same time the one located on the signal lever 30 'presses Pin 30d against the arm 33b of the lever 33, whereby the lever 33 counterclockwise to the Axis 33c is rotated while the opposite arm 33a against the arm 34d of the locking plate 34 pushes and this moves up against the spring force of the spring 34a in the figure until the arms 34b and 34c with the pawl parts 36a and 38a of the drive arms in

Intervention. At this point the locking plate will 34 again by the attraction of the! Permanent magnets 48 on the yoke of the electromagnet

, 40 held.

25th

6 and 7, a further embodiment is illustrated in which the reset

. of the shutter is done using an electromagnetic drive source.
! 30th

In the embodiment according to FIG. 6, the

ι drive shaft 35 of the electromagnetic drive source

not the adjusting lever for the front shutter curtain

35a according to FIG. 4, so that the mirror-flip-up * "lever 22 * not with the arm 22b for engagement with the

03C042 / 0725

-29 "- DE 0300

Adjusting lever 35a is provided. The other parts correspond to the exemplary embodiment according to FIG. 4.

In FIG. 7, reference numeral 90 designates one connected to the output of the differentiating element 85 according to FIG Timer circuit, from the negative differentiating pulse of the differentiating element 85 for outputting a high level Output signal is triggered, which is maintained for a predetermined period of time (of e.g. 20 ms) will. Numeral 91 denotes an inverter connected to the output of the timer circuit 90. With Tr11 to Tr16 denote transistors that form a driver circuit for supplying a drive current to the drive coil 66 of the electromagnetic drive source for the front shutter curtain and the drive coil 66 'of the electromagnetic drive source for the Form rear curtain (not shown). The transistors Tr11, Tr12, Tr13 and Tr14 constitute one Bridge circuit for the drive coil 66 so that the direction of the flowing through the drive coil 66 Stromes is controllable. Another combination of the transistors Tr11, Tr12, Tr15 and Tr16 forms a bridge circuit for the drive coil 66 ', whereby the direction of the current flowing through the drive coil 66' can be controlled is. The driver circuit described above also includes constant current circuits 92 to 95.

The operation of the exemplary embodiments is described in greater detail below 6 and 7 received.

If it is assumed that, as shown in FIG. 6, the tensioning operation for resetting the closure is completed is, as in the case of the embodiment described above, when the (not shown) is actuated Release button of the switch 99 to excite the electromagnet 8 closed, whereupon the automatic shutter drive lever 15 and the mirror

Q3ü (H2 / 0725

- 30 - DE 0300

] drive lever 18 begin to move. At the beginning of the upward movement of the mirror, the switch 77 switches from the contact position "a" to the contact "b" position, so that the Tv-value β stored in the capacitor 76th With the completion of the upward movement of the mirror, the projection 18b of the mirror drive lever 18 presses against the lower end of the switch control lever 51 ', whereby this lever is rotated against the spring force of the spring 51a in the clockwise direction and its free end part the signal IQ switch 29 to signal the termination of the Mirror upward movement closes. The differential element 87 then emits a differentiating pulse which triggers the timer circuit 96 to emit an output signal which has a high level for a predetermined period of time. In response to this high-level signal, the transistor Tr7 for exciting the electromagnet 40 is switched on. The electromagnet 40 therefore generates a magnetic flux of opposite polarity to the magnetic flux of the permanent magnet 48, with the result that the locking of the locking plate 34 is released.

At the same time, the differentiating pulse emitted by the differentiating element 87 is also sent to the set input S. of the flip-flop 88 supplied, whereby the flip-flop 88 is set and its output Q a high level Signal and its output Q emits a signal of low level. As a result, the transistors Tr11 and Tr14 switched through, so that a current in the direction indicated by an arrow A flows, with the result that the drive shaft 35 rotates clockwise rotates and thus also causes a clockwise rotation of the drive arm 36. To this So the shutter begins to open.

030042/0725

- 31 - DE 0300

This setting of the flip-flop 88 also causes the delay element 89 to generate a high-level signal with a predetermined time delay, which is fed to the transistor 81 to block it. As a result, the charging of the capacitor 80 by the collector current of the transistor 79 begins. Since the base of the transistor 79 is connected to the output of the amplifier 78, this collector current corresponds to the logarithmically expanded value of the Tv information stored in the capacitor 76. The charging of the capacitor 80 thus takes place as a function of the shutter speed value determined on the basis of the brightness of the object. If the voltage on the capacitor 80 reaches the reference voltage value Vs within a time interval dependent on this Tv value, the output signal of the comparator circuit 82 is inverted and triggers the differentiating element 83. The differentiating element 83 then emits a differentiating pulse which triggers the timer circuit 84, which then generates an output signal that is high for a predetermined period of time. As a result, the transistor Tr16 is switched on, so that a current flowing in the direction indicated by the arrow A is supplied to the drive coil 66 'of the rear curtain via the transistors Tr11 and Tr16, so that the drive shaft 37 rotates clockwise and the rear one Shutter curtain expires. It should be noted that the duration of the high level output of the timer circuit 84 is set to be slightly longer than that required to cover the entire distance of the trailing movement of the rear curtain in order to ensure that the closure of the shutter is completed with high reliability.

03CG42 / 0725

- 32 - DE 0300

After the end of the sequence movement of the rear shutter curtain, the differentiating element 85 becomes at the transition of the output of the timer circuit 84 is triggered from its high to its low level and emits a differentiating pulse which is fed to the flip-flop 88 to reset it. The differentiating impulse of the differentiator 85 also triggers the timer circuit 90, which thereupon for a predetermined Period of time generates a high level signal, while the inverter 91 outputs a low level signal, resulting in the As a result, the transistors Tr11, Tr14 and Tr16 block and the transistors Tr12, Tr13 and Tr15 are turned on will. Thus, a current flows through the drive coils in the direction indicated by arrow B 66 and 66 ', so that the electromagnetic drive sources for. the front and rear shutter curtains rotate in the opposite direction to the case described above, d. i.e., the drive shafts 35 and 37 are rotated counterclockwise offset. In this way the shutter is reset. It should be noted that the duration of the output signal of the timer circuit 90 is set to a slightly longer value than that used to reset the front and the bottom rear shutter curtain is required. In addition, it should be noted that the output current of the constant current circuit 92 is held higher than the output current of the constant current circuit 94, so that the current flowing through the front curtain drive coil 66 is greater than that through the drive coil 66 'of the rear shutter curtain is flowing current, which has the consequence that the front shutter curtain presses against the rear shutter curtain during the entire return movement of the shutter, so that no accidental opening of the shutter can occur during the reset process.

030042/0725

- 33 - DE 0300

When the shutter resetting operation in this way is completed, the output signal goes off of the timer circuit 90 to a low level at which all transistors of the driver circuit lock, which prevents unnecessary power consumption.

The process following the movement of the rear shutter curtain largely corresponds to this second embodiment and causes the signal switch 39 for the rear shutter curtain of the bent portion 38e of the drive arm 38 is closed, the automatic shutter mechanism and the mirror drive mechanism can be quickly returned and the locking plate 34 returns to its active position.

Another embodiment will be described below in which to prevent an impact or rebound of the shutter curtains a device is provided by which it is possible that at or shortly before the end of the movement of the shutter curtains a larger current than the driver current for the Normal movement of the shutter curtains flows through the drive coils, so that the shutter curtains inevitably be pressed against a holding part or stop member. In this embodiment, the times are at to whom this stream of preventive inspections begins and ends, from a timing circuit based on the start of the power supply for the sequential movement of the shutter estimated and controlled, the controlled time relationship and the current values depending on the individual parameters of the cameras used can be set.

0 3 CG 4 2/0 7 2 5

- 34 - DE 0300

In Fig. 8 a control circuit is shown which is in connection with an electromagnetically operated shutter which has the same structure as the embodiment shown in FIGS. 1 and 2 can be used having. In Fig. 8, the same reference numerals designate circuit parts and components having the same functions as in the case of the embodiment described above.

Reference numerals 101 and 102 denote timer circuits associated with the output of the above Differentiating element 83 are connected and from the negative differentiating pulse of the differentiating element 83 are triggered, resulting in high-level output signals by means of respective timing elements from variable variable resistors and capacitors (116, 117 and 118, 119) for predetermined Time intervals are maintained. The reference numeral 115 denotes an ANTIVALENCE element that has one input to the output of the timer circuit 10.1 and another input to the output of the timer circuit 102 is connected. Reference numeral 103 denotes a to the output of the timer circuit 101 connected differentiator. The reference number 29 denotes a switch arranged to close upon completion of the upward movement of the mirror will. When the switch is closed, a downstream differentiating element 105 is negative Differentiating pulse. With 106 and 109 are timer circuits denotes, which are triggered by the differentiating pulse of the differentiating element 105, whereby High level output signals via respective timers (107, 108 and 110, 111) for predetermined time intervals be maintained. Reference numeral 112 denotes an ANTIVALENCE element connected to the outputs of the timer circuits 106 and 109.

030042/0725

- 35 - DE 0300

The reference numeral 66 denotes the drive spool for the front shutter curtain, while the reference numeral 66 'the drive coil for the rear shutter curtain designated. With 120 to 123 field effect transistors are designated, while with 124 to 127 variable resistors are designated, the negative feedback between the respective source and gate electrodes of the above called field effect transistors are connected and together with the field effect transistors Konstantetromschaltungen form whose current setpoints are adjustable. Switching transistors are designated by Tr21 to Tr24, their respective base with the output of the ANTIVALENZ gate 112, the output of the timer circuit 109, the Output of the ANTIVALENZ element 115 or the output of the timer circuit 102 via a respectively assigned Resistance are connected.

The reference number 113 denotes an RS flip-flop circuit, the set input of which is connected to the output of the differentiating element 105, the reset input of which is connected to the output of the differentiating element 103 and the output Q of which is connected to a delay element 114. The output Q ^{1 of} the delay element 114 is connected via a resistor to the base of the count start switching transistor 81 described above.

The operation of this will now be explained in more detail with reference to the control signal diagram of FIG

Embodiment received the control circuit. 30th

The operator will first press the release button (not shown), causing the electromagnet 8 is supplied with power and enables the automatic shutter mechanism and the mirror drive mechanism or triggers, as has already been described above in connection with the first exemplary embodiment.

03CCA2 / 0725

- 36 - DE 0300

The mirror then moves upwards, following the release of the lock from its locking position.

When the upward movement of the oscillating mirror or rapid mirror has ended, the switch 29 is closed, whereby the differentiating element 105 emits a negative differentiating pulse. Through this impulse the downstream timer circuits 106 and 109 triggered, which has the consequence that their output signals T1 and T2 go high as shown in FIG. The output signal E1 of the ANTIVALENZ -Glement 112 thereby goes over to a low level at which the switching transistor Tr22 is turned on while the transistor Tr21 continues to block. Then, an flows in from the constant current circuit 121, 125 regulated constant current through the drive coil 66 of the front shutter curtain and the front The shutter curtain begins to run down. When the front shutter curtain approaches the end of its travel, the output signal T1 of the timer circuit 106 transitions from its high level to its low level during the Output signal T2 of the timer circuit 109 continues remains at its high level. The output signal E1 of the ANTIVALENCE element 112 therefore goes high Level above, at which the switching transistor Tr21 is now also switched through. Thus, the sum of the Currents regulated by the constant current circuits 120, 124 and 121, 125 through the drive coil 66 of the front Shutter curtain. Although the front shutter curtain hits a stop element (not shown), after the upper end of its lamella 42-3 (FIG. 2) has passed through the image window 41a, it hardly bounces off this Stop element back, as it is with a stronger force than during the drainage movement against the stop element is pressed, so that there is no possibility that the upper end of the shutter lamella the area of the opening

030042/0725

- 37 - DE 0300

tion of the image window 41a reached. The recoil force resulting from the impact is quickly dampened and the shutter curtain comes to a standstill.
5

When the negative differentiating pulse is output from the differentiating element 105 after the switch 29 is closed, the RS flip-flop circuit 113 is set so that its output signal Q1 is inverted and goes to a high level. After a certain time delay, the output signal Q ¹ I of the delay element 114 is also inverted and changes to a high value, as a result of which the count start switching transistor 81 blocks. The timing capacitor 80 is then charged with the current supplied via the transistor 79 in order to achieve a time expansion. When the voltage on the capacitor 80 has reached a predetermined value, the output signal of the operational amplifier 82 changes from its high level to its low level, whereby the downstream differentiating element 83 emits a negative differentiating pulse, which triggers the timer circuits 101 and 102, so that their output signals T3 and T4 each go high. Since the output signal E2 of the ANTIVALENZ gate 115 is at a low level at this point in time, the switching transistor Tr24 is turned on, while the switching transistor Tr23 continues to block. As a result, a flow from the constant current circuit 123,

127 Regulated constant current through the drive coil on
^ou 66 'of the rear shutter curtain, which is to expire

begins.

03CG42 / 0725

- 38 - DE 0300

J When the rear shutter curtain is at the end of its The output signal T3 approaches / goes out of sequence movement Timer circuit 101 changes from its high to its low level. Since the output signal T4 of the timer circuit 102 continues to remain at its high level, the output signal E2 of the ANTIVALENCE element 115 becomes inverts and goes to its high level, so that the switching transistor Tr24 is now also turned on will. In this way, the sum of the amount regulated by the constant current circuits 122, 126 and 123, 127 flows Constant currents through the drive coil 66 'of the rear Shutter curtain, whereby on the rear shutter curtain at the time at which it is on the (not shown) Stop element or the front shutter curtain hits a greater force than that during his Sequence movement acting driving force is exerted. The rear curtain thus comes like the front curtain without the occurrence of rebound to a standstill, so that there is no possibility that a re-exposure takes place.

When the output signal T3 of the timer circuit 101 goes from its high level to its low level, the differentiator 103 outputs a negative Differentiating pulse from the reset input of the RS flip-flop circuit 113 is supplied. This has to The result is that their output signal Q1 is inverted and transitions from its high level to its low level. After a certain time delay that works too Output signal Q'1 of the delay element 114 on his low level, at which the counting start switching transistor 81 to discharge the timing capacitor 80 is switched through and the output signal 0P1 of the

3-> op amp 82 goes high.

030042/0725

- 39 - DE 0300

After the shutter is closed, the automatic shutter mechanism, the oscillating mirror or Rapid mirror and the shutter return mechanism in the same manner as in the case of the one described above first embodiment.

In the present embodiment, rebound occurs the shutter curtains by the electromagnetic Drive sources prevented, as a strong at the end of the movement of the front and rear shutter curtains Current can flow through the respective drive coils. The duration and timing of the feeding of this strong Current (i.e., point in time and duration at which the output signal E2 or E1 of the ANTIVALENCE element 115 or the ANTIVALENCE element 112 assumes its high level) by setting the time constants of the Timer circuits 101, 102 or 106, 109 are specified by means of the variable resistors 116, 118 or 107, 110.

Ideally, this is the point in time at which the output signal E2 or E1 of the respective ANTIVALENZ element 115 or 112 is inverted and at its high level passes, set to or shortly before the point in time at which the sequence movement of the front or rear Shutter curtain is completed, while the duration for which the output signal E2 or E1 its high level maintains, ideally for the duration of the rebound. «of the front or rear shutter curtain

is.
30th

In this case, the amount that flows through the respective drive coil to prevent rebounding can be used Current through the variable resistors 124, 125 and 126, 127 of the constant current circuits are set in this way

become that the current value of the individual rebound characteristic of the lock used in each case.

03G042 / 0725

- 40 - DE 0300

fits is.

In FIGS. 10 to 12 there is a further embodiment illustrates in which the timing of the supply of an additional current to the respective Drive coil of the shutter curtains as a function of the determined using a switch Position of the front and rear shutter curtains takes place when they run down.

In Fig. 10 is the structure of the electromagnetically operated shutter used in this embodiment shown. Fig. 11 illustrates the control circuit used in this embodiment and Fig. 12 shows an associated control signal diagram.

In Fig. 10, reference numeral 200 denotes one associated with the running movement of the front shutter curtain Detector switch, which is provided with two contacts, the so in the rotary path of the above described locking lever 35a lie that they of the locking lever 35a shortly before completion closed by the movement of the front shutter curtain.

Numeral 201 denotes one of the sequence movements the detector switch associated with the rear shutter curtain, which is provided with two contacts, which are fixedly attached to the drive shaft 37 of the rear shutter curtain in the rotary path of a Lever 37a lie that they are closed when the lever 37a just before the end of the drainage movement of the rear shutter curtain presses against them. The other features of this closure correspond to the embodiment according to FIG. 1.

03C042 / 0725

- 41 - DE 0300

In the control circuit according to FIG. 11, the same reference numerals as in the exemplary embodiment according to FIG. 8 are provided for identical or similar components and circuit parts. The reference number 200 denotes the above-described detector switch for the movement of the front shutter curtain, while the reference number 202 denotes a differentiator which responds to the closing of the detector switch 200 by emitting a negative differentiating pulse. Reference number 203 denotes a timer circuit which is triggered by the output pulse of the differentiating element 202 and then emits an output signal T5 which assumes a high level for a predetermined period of time dependent on a variable resistor 204 and a capacitor 205. Reference numeral 206 denotes an RS flip-flop circuit whose set input is connected to the output of differentiator 105 and whose reset output is connected to the output of a differentiator 207, which in turn is connected to output T5 of timer circuit 203. The reference number 201 denotes the above-described detector switch for the movement of the rear shutter curtain, while the reference number 208 denotes a differentiating element which responds to the closing of the detector switch 201 by generating a negative differentiating pulse. The reference numeral 209 denotes a timer circuit which is triggered by the output pulse of the differentiating element 208, its output signal T6 assuming a high level for a period dependent on a variable resistor 210 and a capacitor 211. Reference numeral 212 denotes an RS flip-flop circuit whose set input is connected to the output of differentiating element 83 and whose reset input is connected to the output of a differentiating element 213

* "are connected, which in turn is associated with the

03 ". 042/0725

- 42 - DE 0300

output T6 of the timer circuit 209 is connected.

Furthermore, switching transistors Tr21 to Tr24 are provided, the respective bases of which have an associated Resistance to the output T5 of the timer circuit 203, the Q output Q2 of the RS flip-flop 206, the Output T6 of the timer circuit 209 and the Q output Q3 of the RS flip-flop 212 are connected.

The operation will now be described in greater detail with reference to the control signal diagram of FIG received the circuit arrangement described above.

As in the case of the embodiment described above, the differentiating element 105 gives the dependent from the completion of the upward movement of the oscillating mirror or rapid mirror closing of the switch 29 from a negative differentiating pulse, which sets the RS flip-flop circuit 206, whereupon the output via the Q output signal Q2 is inverted and goes to a high level, whereby the Switching transistor Tr22 is turned on. As a result, the drive spool 66 of the front shutter curtain is applied with a constant current determined by the constant current circuit -121, 125, so that the drive shaft 35 and drive arm 36 rotate clockwise and the front shutter curtain 42 begins to expire. When the top of the front shutter curtain is at the bottom of the picture window 41a has moved past and a position shortly before it hits a stop element (not shown) reached, the reset lever 35a, which is fixedly attached to the drive shaft 35, strikes against the contacts of the

monitoring the movement of the front shutter curtain Detector switch 200, whereby the detector

03 C042 / 0725

- 43 - DE 03OO

Switch 200 is closed. This has the consequence that the differentiating element 202 has a negative differentiating pulse which triggers the timer circuit 203. Its output signal T5 is thereby inverted and for a certain period of time dependent on the variable resistor 204 and the capacitor 205 at a high level held. During this time, the switching transistor Tr21 is also turned on, so that the drive coil 66 of the front shutter curtain in addition to the current supplied through the constant current circuit 121, 125 with that from the constant current circuit 120, 124 supplied current is applied. The shutter curtain is thus as in the case described above Prevention of rebounding held because a stronger force than that acting during the process Driving force is applied. After a certain time has elapsed, the output signal T5 of the timer circuit goes 203 to a low level over, wherein the differentiating element 207 a negative differentiating pulse outputs which resets the RS flip-flop circuit 206, whereby its output signal Q2 goes low. In this way the shear transistors become Tr21 and Tr22 both blocked for de-energizing the drive coil 66.

If the upward movement of the oscillating mirror or rapid mirror terminated and the switch 29 is closed, the negative differential pulse the RS flip-flop ¹ ^ circuit 113 set by the differentiator 105 also at delivery, which output an inversion of the via its Q output Output signal Q1 has resulted in a high level. After a certain time delay, the output signal Q ¹ I of the delay element 114 also changes to a high level, with the result that the count start switching transistor 81 blocks and the charging of the time control capacitor 80 begins. When the tension

310 4 2/0725

- 44 - DE 0300

JL of the capacitor 80 has reached a predetermined value, the output signal 0P1 of the operational amplifier 82 goes to a low level, as a result of which the differentiating element 83 emits a negative differentiating pulse, by which the RS flip-flop 212 is set, whereby the output signal via its Q- Output signal Q3 goes high. As a result, the switching transistor Tr24 is switched on, so that the drive coil 66 * of the rear shutter curtain is supplied with a constant current regulated by the constant current circuit 123, 127. This has the consequence that the drive shaft 37 and the drive arm 38 rotate in a clockwise direction and the rear shutter curtain 43 begins to run down.
15th

When the rear shutter curtain 43 has reached the end of its movement, it hits the drive shaft 37 firmly attached lever 37a against the contact of the running movement of the rear shutter curtain monitoring detector switch 201, whereby the detector switch 201 is closed. This has the consequence that the differentiating element 208 has a negative differentiating pulse outputs, by which the timer circuit 209 is triggered. As a result, the output signal T6 the timer circuit 209 is inverted and for one of the variable resistor 210 and the capacitor 211 dependent held at a high level for a certain period of time, so that the switching transistor Tr23 is also turned on.

During this time, the rear shutter drive coil 66 is thus operated with a constant current applied, which is the sum of the constant current circuit 123, 127 represents the regulated current and the current regulated by the constant current circuit 122, 126, thereby preventing the rear curtain from rebounding.

03C042 / 0725

- ■ wiL / NSPECTEO

- 45 - DE 0300

When the time set in this way has passed and the output signal T6 of the timer circuit goes to a low level, gives the differentiator 213 from a negative differentiating pulse, by which the RS flip-flop circuit 212 is reset, so that its output signal Q3 emitted via the Q output goes to a low level. This will be the two switching transistors Tr23 and Tr24 to terminate the excitation of the drive coil 66 'blocked, while the RS flip-flop 113 by the differentiator 213 issued differentiating pulse is reset.

In the present embodiment, the duration during which the switching transistors Tr21, Tr22, Tr23, Tr24 are kept conductive to prevent rebounding (i.e., the length of time that the output signal T5 of the timer circuit 203 or the output signal T6 of the timer circuit 209 a high Level), depending on the individual

Rebound time of the particular closure used by setting the variable resistor 204 or the variable resistor 210 set to a correct value.

Furthermore, the amount of current with which ^ the drive coil 66 or 66 'to prevent the Rebound is applied, in a suitable manner of the individual rebound strength of each used Closure by setting the variable resistors 124 to 127 of the constant current circuits accordingly

customized.

The exemplary embodiments described above thus relate to a single-lens reflex camera, their focal plane shutter from an electric

Drive source is driven. To prevent a

03CG42 / 072 5

- 46 - DE 0300

unintentional triggering of an exposure due to incorrect operation of switches, due to a shock or the like. A locking device is provided, which the shutter curtains before they run off is locked in their initial positions and arranged so that they are upon completion of the upward movement of the oscillating mirror or rapid mirror of the camera can be actuated to release the locking connection.

03C0 42/0725

Lee rse

it

Claims (12)

TlEDTKE - Bühling - KlNNE Grupe - Pellmann * "Dipl.-Ing.R. Kinne 3011693 ^D ! ^pK " ^ln9 * ^{R group} Dipl.-Ing. B. Pellmann> Bavariaring 4, Postfach 20 2403 8000 Munich 2 Tel .: 089-539653 Telex: 5-24845 tipat 'cable: Germaniapatent Munich March 25, 1980 DE 0300 Claims Camera with a focal plane shutter having a front and a rear shutter curtain, electromagnetic drive sources for driving the front and rear shutter curtains and one electrical power source, characterized by a locking device (34, 36a, 38a), which with the front shutter curtain (42) and the rear shutter curtain (43) in their ready-to-run positions is engageable, thereby keeping the shutter curtains inoperative, and by means (51, 18b, 40), which releases the locking of the shutter curtains before power is supplied to the electromagnetic drive sources (67, 66, 66 '). 2. Camera according to claim 1, characterized in that a mirror drive device (18, 22) for upward movement and return of a known oscillating mirror or rapid mirror (27) is provided and that the locking means, the front and the rear shutter curtain in dependence on the Releases actuation of the mirror drive device upon completion of the upward movement of the mirror. 3. Camera according to claim 1 or 2, characterized by a device (35 a), the front and the rear shutter curtain depending on the actuation of the mirror drive device (22). 030CU2 / Q72S X / rs Deutsche Bank (Munich) Account 51/61070 Dresdner Bank (Munich) Account 3939 844 Postscheck (Munich) Account 670-43-804 - 2 - 'DE 0300 when the oscillating mirror returns. 4. Camera according to one of claims 1 to 3, characterized by a permanent magnet (48) for holding the locking device (34) in a locking position and by an electromagnet (40), which is seen in relation to a trigger actuation of the camera before the start of the power supply to the electromagnetis Drive sources can be excited in such a way that the locking device is released. 5. Camera according to claim 2, characterized in that a locking release member (51) for a one '5 handle provided with the mirror drive device (18) is that on the mirror flip-up movement of the mirror drive device (18) responds and a lock locking part (34) for releasing the lock lock emotional. 6. Camera according to one of claims 1 to 5, characterized by a device (39, 97 ') which controls the sequence movement of the rear shutter curtain to generate a signal is monitored, and by a device (32) which respond to this signal to form a signal for controlling the return movement of the mirror appeals to. 7. Camera according to one of claims 1 to 6, ge characterized by a device (29, 87, 96) which responds to a detection of the termination of the upward movement of the oscillating mirror for generating a signal is responsive and by means (40) responsive to this Signal for releasing the lock locking part ■ (34) responds from the locking connection. 03Ö042 / 0726 - · ■ ".? - ■ '■' DE 0300 8. A camera according to claim 6, characterized by means (30, 30a, 33) responsive to the mirror return control signal (32) for returning the lock locking part (34) to the lock locking position appeals to. 9. Camera according to one of claims 1 to 8, characterized by a control circuit (84, 101, 102, 106, 109, 113, 212, 208, 209, 206, 202, 203) which the electromagnetic drive sources (66, 66 ') supplies a drive current via the electrical power source and the flow of drive current in the same direction for a certain time after a shutter curtain has expired maintains. 10. Camera according to claim 9, characterized in that the control circuit current amplifying devices (120, 124, Tr21, 112, 122, 126, Tr23) to increase the drive current for a certain period of time having after running off a shutter curtain. 11. A camera according to claim 10, characterized in that the current amplifying devices are actuating devices (24, 125, 126, 127) for setting the current value. 12. Camera according to claim 10 or 11, characterized in that the current amplifying devices have switches (200, 201) that are operatively connected to the shutter curtains. 030042/0725